KR102416898B1 - Motor-driven compressor - Google Patents

Abstract

The motor-driven compressor includes a compression mechanism, a motor mechanism, an inverter, a motor housing, an inverter case, and a plurality of fasteners. The inverter case has a tubular peripheral wall and a bottom wall that closes one end of the peripheral wall. The bottom wall has an inner surface of the cover positioned to face the space accommodating the inverter. The fastener is inserted and passed through one end of the motor housing while penetrating the peripheral wall. A plurality of ribs are formed on the inner surface of the lid to be spaced apart from the circumferential wall, and a grid is formed by arranging the plurality of ribs.

Description

Electric Compressor {MOTOR-DRIVEN COMPRESSOR}

The present disclosure relates to an electric compressor.

Japanese Patent Application Laid-Open No. 2013-177826 discloses a conventional electric compressor. This electric compressor includes a compression mechanism, a motor mechanism, an inverter, a motor housing, and an inverter case.

The compression mechanism compresses the refrigerant as a fluid. The motor mechanism drives the compression mechanism. The inverter drives and controls the motor mechanism. The motor housing has a cylindrical shape and accommodates the motor mechanism inside. The inverter case houses the inverter inside. The motor housing and the inverter case are fastened by a plurality of bolts. The inverter case has an inverter box in contact with one end of the motor housing, and an inverter cover that forms a space for accommodating the inverter together with the inverter box.

The inverter box has a first cylindrical wall that is erected from the periphery of the motor housing. The inverter cover has a cylindrical second circumferential wall abutting on the end face of the first circumferential wall, and a second bottom wall having a disk shape extending in the radial direction from the second circumferential wall. The second bottom wall has an inner surface of the cover positioned to face the space, and an outer surface of the cover positioned on the opposite side to the inner surface of the cover. A plurality of ribs projecting toward the inverter are formed on the inner surface of the cover of the inverter cover. Each rib is connected to a boss formed in the second peripheral wall.

In this electric compressor, the rigidity of the bottom wall of an inverter cover is raised by each rib, and the vibration of the bottom wall which arises by operation|movement of an inverter is suppressed. In particular, each rib is connected to the boss of the second circumferential wall to ensure high rigidity of the bottom wall. Thereby, vibration of the bottom wall is suppressed. For this reason, in this electric compressor, suppression of noise is aimed at realizing manufacturing an inverter cover by casting.

However, in the above conventional electric compressor, each rib is connected to the boss of the second peripheral wall, so that each rib is connected to the bolt for fastening the inverter cover and the inverter box. For this reason, the vibration of the compression mechanism adjacent to the motor housing or the motor mechanism is easily transmitted to the inverter cover through those bolts.

Further, in this motor-driven compressor, in the inverter cover, vibration transmitted to a rib through one bolt resonates with vibration transmitted to the rib from another bolt, and there is a fear that the vibration is amplified.

Japanese Laid-Open Patent Publication No. 2013-177826

An object of the present disclosure is to provide an electric compressor having a high noise suppression effect.

An electric compressor of one aspect includes a compression mechanism configured to compress a fluid;

a motor mechanism configured to drive the compression mechanism;

an inverter configured to drive the motor mechanism;

A motor housing having a cylindrical shape and accommodating the motor mechanism therein;

an inverter case accommodating the inverter therein;

and a plurality of fasteners for fastening the inverter case to the motor housing,

The inverter case has a circumferential wall having a cylindrical shape and a bottom wall blocking one end of the circumferential wall,

The bottom wall has an inner surface of the cover positioned to face the space accommodating the inverter,

The fastener is inserted through one end of the motor housing while penetrating the peripheral wall,

A plurality of ribs are formed on the inner surface of the cover to be spaced apart from the peripheral wall, and a grid is formed by arranging the plurality of ribs.

In the motor-driven compressor, since the inverter case is fastened to the housing by fasteners penetrating the peripheral wall, vibration of the motor housing is easily transmitted to the bottom wall through the fasteners in the inverter case during operation. Here, in this electric compressor, a grid|lattice is formed by arranging a plurality of ribs spaced apart from the peripheral wall on the inner surface of the cover of the bottom wall. Also, these gratings are in the central part of the bottom wall.

In this way, in this motor-driven compressor, vibration of the motor housing during operation makes it easy to vibrate in the vicinity of the peripheral wall where the ribs do not exist in the inverter case. For this reason, vibrations of the motor housing can be absorbed in the vicinity of the peripheral wall. Accordingly, it is possible to suppress the vibration of the motor housing from being transmitted to the central portion of the bottom wall, and it is possible to suppress the vibration of the central portion of the bottom wall during operation. Here, in the bottom wall, it is the central part which is located away from the peripheral wall to generate|occur|produce noise easily by vibration. For this reason, if the vicinity of the peripheral wall is actively vibrated, while the lattice is formed to increase rigidity to suppress the vibration in the central portion, noise is hardly generated even when the vibration of the motor housing is transmitted to the inverter case during operation.

The lattice is one of a plurality of lattices formed in succession, and the shape of the plurality of lattices is preferably the same. In this case, the rigidity in the central portion is uniformly increased, and even if vibration is transmitted, it is difficult to greatly deform a specific location, and as a result, it is easy to suppress the vibration in the central portion.

The bottom wall, with respect to the inner surface of the cover, may have an outer surface of the cover located on the opposite side to the space accommodating the inverter. On the outer surface of the cover, a plurality of additional ribs are formed, and a plurality of additional lattices arranged in a row may be formed by arranging the plurality of additional ribs. It is preferable that the plurality of grids and the plurality of additional grids each have the same square shape.

In addition, the plurality of grids and the plurality of additional grids are preferably arranged so that the other corner of the grid and the additional grid is located at the center of a region surrounded by one of the grid and the additional grid. In this case, the rigidity in the central portion is further increased and uniform, so even if vibration is transmitted, it is difficult to greatly deform a specific portion, and as a result, it is easy to suppress the vibration in the central portion.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal sectional view of the electric compressor of 1st Embodiment.
Fig. 2 is a bottom view showing an inner surface of a cover of an inverter cover relating to the electric compressor according to the first embodiment.
Fig. 3 is a plan view showing an outer surface of a cover of an inverter cover relating to the electric compressor according to the first embodiment.
Fig. 4 is a plan view showing the inner surface of the cover from the outer surface of the cover of the inverter cover, which relates to the electric compressor according to the first embodiment.
Fig. 5 is a cross-sectional view of a second bottom wall of an inverter cover relating to the electric compressor according to the first embodiment.
Fig. 6 is a bottom view showing the inner surface of the cover of the inverter cover, which relates to the electric compressor according to the second embodiment.
Fig. 7 is a bottom view showing the inner surface of the cover of the inverter cover, which relates to the electric compressor according to the third embodiment.

(details)

EMBODIMENT OF THE INVENTION Hereinafter, 1st - 3rd Embodiment is demonstrated, referring drawings.

(First embodiment)

As shown in FIG. 1 , the electric compressor of the first embodiment includes a housing 10 , a motor mechanism 9 , a scroll-type compression mechanism 11 , and an inverter 13 . The housing 10 includes a front housing 1 , a motor housing 3 , an inverter box 5 , and an inverter cover 7 .

In the following description, the left side of FIG. 1 is defined as the front side of the motor-driven compressor, and the right side of FIG. 1 is defined as the rear side of the motor-driven compressor. In addition, the upper side in Fig. 1 is defined as the upper side of the motor-driven compressor, and the lower side in Fig. 1 is defined as the lower side of the motor-driven compressor. In addition, both the front-back direction and the up-down direction shown in each figure after FIG. 2 correspond to FIG. 1, and are displayed. In addition, the front-back direction in 1st Embodiment is an example. The electric compressor is suitably changed in the front-back direction corresponding to the vehicle on which it is mounted.

As shown in FIG. 1 , the front housing 1 and the motor housing 3 face each other and are fastened to each other by a plurality of bolts 18 . The motor housing 3 has a bottomed cylindrical shape with an opening facing the front housing 1 . A shaft support member 15 is formed in the motor housing 3 , and a fixed scroll 17 is formed in front of the shaft support member 15 . The front housing 1 and the motor housing 3 accommodate the fixed scroll 17 and the shaft support member 15 in a state in which they abut against each other.

In the center of the inner surface of the bottom wall 3a on the rear side of the motor housing 3, a cylindrical shaft support portion 3b is formed so as to protrude forward. On the other hand, the shaft support member 15 consists of a cylindrical body part 15a and the flange part 15b which protrudes outward from the opening edge of the front end of the body part 15a. A shaft hole 15c is formed through the center of the body portion 15a. The flange portion 15b is fixed to the inner peripheral surface of the motor housing 3 . On the front side of the flange portion 15b, a rotation preventing pin 21a that regulates the rotation of the movable scroll 19 described later and enables only revolution is formed so as to protrude forward.

A rotating shaft 23 extending in the front-rear direction is inserted through the shaft hole 15c. Each end of the rotary shaft 23 is rotatably supported by the shaft support member 15 and the shaft support part 3b via radial bearings 25 and 27 . A sealing material 29 is formed behind the radial bearing 25 , and the sealing material 29 seals between the shaft support member 15 and the rotating shaft 23 .

At the front end of the rotating shaft 23 , a cylindrical eccentric pin 23a is formed to protrude from a position eccentric from the central axis O of the rotating shaft 23 . A bush 31 is fitted and supported by the eccentric pin 23a. A balance weight 31a that spreads outwardly in a fan shape is integrally formed on the substantially half-circumferential portion of the outer peripheral surface of the bush 31 .

The fixed scroll 17 includes a fixed substrate 17a having a disk shape extending in the radial direction, a shell 17b extending from the outer periphery of the fixed substrate 17a to a rearward cylindrical shape, and a shell 17b. It consists of a fixed spiral wall 17c extending in a spiral shape from the inside of the fixed substrate 17a toward the rear.

On the other hand, a movable scroll 19 is formed between the bush 31 and the fixed scroll 17 via a radial bearing 33 . The movable scroll 19 includes a movable substrate 19a having a disk shape extending in the radial direction, and a movable spiral wall 19b extending forward from the movable substrate 19a in a spiral shape. The movable spiral wall 19b is engaged with the stationary spiral wall 17c.

In the rear surface of the movable substrate 19a, a rotation blocking hole 21b for receiving the rotation blocking pin 21a with a clearance at the front end thereof in a fitted state is formed so as to be recessed. A cylindrical ring 21c is fitted in the rotation blocking hole 21b with a clearance. When the rotation-preventing pin 21a slides and rolls on the inner peripheral surface of the ring 21c, the movable scroll 19 is regulated to rotate and can only revolve around the central axis O. A compression chamber 35 is partitioned by a fixed substrate 17a, a fixed spiral wall 17c, a movable substrate 19a, and a movable spiral wall 19b.

In the motor housing 3 , a motor chamber 37 is formed behind the shaft support member 15 . The motor chamber 37 also serves as a suction chamber. In the motor chamber 37 , a stator 39 is fixed to the inner peripheral surface of the motor housing 3 and is formed. A rotor 41 fixed to the rotating shaft 23 is formed inside the stator 39 . When the rotor 41 and the rotating shaft 23 rotate integrally due to the energization of the stator 39, the driving force is transmitted to the movable scroll 19 through the eccentric pin 23a and the bush 31, and the movable scroll ( 19) is supposed to orbit.

In the peripheral wall 3c of the motor housing 3, a suction port 3d for communicating the motor chamber 37 with the outside is formed therethrough. The suction port 3d is connected to an evaporator (not shown) by piping. The evaporator is connected to the expansion valve and the condenser by piping. The low-pressure and low-temperature refrigerant in the evaporator is introduced into the motor chamber 37 from the suction port 3d and is supplied to the compression chamber 35 through a suction passage (not shown) formed in the shaft support member 15 . .

A discharge chamber 43 is formed between the fixed substrate 17a and the front housing 1 . A discharge port 17d is formed to penetrate through the center of the fixed substrate 17a , and the discharge port 17d communicates with the compression chamber 35 and the discharge chamber 43 . A discharge valve (not shown) for selectively opening and closing the discharge port 17d in the discharge chamber 43 and a retainer 45 for regulating the opening degree of the discharge valve are formed in the fixed substrate 17a.

In the front housing 1, a discharge port 1a for communicating the discharge chamber 43 with the outside is formed so as to pass therethrough. The discharge port 1a is connected to a condenser (not shown) by piping. The refrigerant introduced into the discharge chamber 43 is discharged to the condenser through the discharge port 1a.

Motor chamber (37), rotating shaft (23), bush (31), radial bearing (33), movable scroll (19), fixed scroll (17), discharge chamber (43), discharge valve and retainer (45), etc. A compression mechanism 11 for compressing the refrigerant is constituted by the components of The compression mechanism 11 may also include an oil separator formed in the discharge chamber 43 . The motor mechanism 9 which drives the compression mechanism 11 by the rotor 41, the stator 39, and the rotating shaft 23 is comprised. The compressor main body 20 is comprised by the front housing 1, the motor housing 3, the compression mechanism 11, the motor mechanism 9, and the bolt 18. As shown in FIG.

The inverter box 5 is fastened to the motor housing 3 of the compressor body 20 through a gasket 47 together with the inverter cover 7 by a plurality of bolts 49a to 49d. The inverter box 5 and the inverter cover 7 constitute an inverter case 30 accommodating the inverter 13 in the inner space 30a. A gasket (not shown) is also formed on the bonding surface between the inverter box 5 and the inverter cover 7 .

The inverter box 5 has a cylindrical shape and has a first peripheral wall 5a that is erected from the periphery of the motor housing 3 . The inverter cover 7 has a cylindrical second peripheral wall 7a in contact with the rear end surface of the first peripheral wall 5a, and a second bottom wall 7b that closes the rear end of the second peripheral wall 7a. have it The bolts 49a to 49d are inserted through the first peripheral wall 5a of the inverter box 5 and the second peripheral wall 7a of the inverter cover 7, and the peripheral wall 3c of the motor housing 3 is It is also inserted through. Bolts 49a to 49d correspond to fasteners. 2 to 4 , the bolts 49e to 49g fasten only the inverter cover 7 and the inverter box 5 .

As shown in Fig. 1, the bottom wall 3a of the motor housing 3, the first peripheral wall 5a of the inverter box 5, and the second peripheral wall 7a and the second bottom wall of the inverter cover 7 ( 7b) forms the space 30a. The inverter 13 has a semiconductor element 53 such as a switching element formed on the substrate 51 . The substrate 51 is fixed to the bottom wall 3a of the motor housing 3 .

The second bottom wall 7b of the inverter cover 7 has a cover inner surface 8a positioned to face the space 30a and an outer cover surface 8b positioned on the opposite side to the cover inner surface 8a. The cover inner surface 8a is uniformly flat in the vicinity of the boundary with the second peripheral wall 7a. The inverter 13 shown in FIG. 1 is connected to an external controller by a lead wire (not shown) that is inserted through an outlet (not shown) to drive and control the motor mechanism 9 .

As shown in Fig. 2, a plurality of ribs 55 are formed on the inner surface of the cover 8a to be spaced apart from each of the bolts 49a to 49g and the second circumferential wall 7a. Each rib 55 is composed of a vertical rib 55a extending linearly in the vertical direction and a horizontal rib 55b extending linearly in the left-right direction when the motor-driven compressor is mounted on the vehicle. Between the bolt 49a and the bolt 49b, between the bolt 49b and the bolt 49c, between the bolt 49c and the bolt 49d, between the bolt 49d and the bolt 49e, between the bolt ( 49e) and the bolt 49f, between the bolt 49f and the bolt 49g, and between the bolt 49g and the bolt 49a, two or more vertical ribs 55a or horizontal ribs 55b are provided. is formed

In addition, the vertical ribs 55a and the horizontal ribs 55b are arranged on the inner surface 8a of the cover to form a plurality of grids 55c. Each grating 55c has a square shape. The inside of each grid 55c is flush with the cover inner surface 8a. The adjacent grids 55c have a vertical rib 55a and a horizontal rib 55b in common, and a plurality of grids 55c are sequentially formed. The shape of each grating 55c is the same, respectively. The vertical ribs 55a and the transverse ribs 55b extend to the vicinity of the second peripheral wall 7a, but are not continuous to the second peripheral wall 7a. For this reason, each lattice 55c is positioned equally spaced from each of the bolts 49a to 49g.

As shown in Fig. 3, a plurality of additional ribs 57 are formed on the cover outer surface 8b to be spaced apart from each of the bolts 49a to 49g and the second circumferential wall 7a. Each additional rib 57 is composed of a vertical additional rib 57a extending in the vertical direction and a horizontal additional rib 57b extending in the left-right direction when the motor-driven compressor is mounted on the vehicle. Between the bolt 49a and the bolt 49b, between the bolt 49b and the bolt 49c, between the bolt 49c and the bolt 49d, between the bolt 49d and the bolt 49e, between the bolt ( 49e) and the bolt 49f, between the bolt 49f and the bolt 49g, and between the bolt 49g and the bolt 49a, two or more vertical additional ribs 57a or horizontal additional ribs 57b ) is formed.

In addition, the vertical additional ribs 57a and the horizontal additional ribs 57b are arranged on the cover outer surface 8b to form a plurality of additional grids 57c. Each additional grating 57c has a square shape. Each additional grating 57c is flush with the cover outer surface 8b. The additional gratings 57c adjacent to each other share a vertical additional rib 57a and a horizontal additional rib 57b in common, and a plurality of additional gratings 57c are formed one after another. Each of the additional gratings 57c has the same shape. The longitudinal additional ribs 57a and the transverse additional ribs 57b extend to the vicinity of the second peripheral wall 7a, but are not continuous to the second peripheral wall 7a. For this reason, a part of each of the additional gratings 57c is also at a common position equally spaced from each of the bolts 49a to 49g.

As shown in Fig. 4, each grating 55c and each additional grating 57c are displaced. That is, as shown in Fig. 5, the vertical rib 55a and the vertical additional rib 57a do not coincide with the front and rear, and the horizontal rib 55b and the horizontal additional rib 57b do not coincide with the front and rear. Each grating 55c and each additional grating 57c is at the center of a region surrounded by one of the grating 55c and the additional grating 57c, and at the corner of the other side of the grating 55c and the additional grating 57c. is arranged so that

The electric compressor configured as described above constitutes the refrigeration circuit of the vehicle air conditioner together with the evaporator, the expansion valve, and the condenser. This electric compressor operates as follows. That is, when the driver of the vehicle operates the vehicle air conditioner, the inverter 13 controls the motor mechanism 9 to rotate the rotor 41 and the rotating shaft 23 . Then, the eccentric pin 23a pivots around the axis of the fixed scroll 17 . At this time, as for the movable scroll 19, when the rotation preventing pin 21a slides and rolls along the inner peripheral surface of the ring 21c, the rotation is prevented, and only revolution is allowed around the central axis O. Then, due to revolution of the movable scroll 19, the compression chamber 35 is moved while decreasing in volume from the radially outer side of the both scrolls 17 and 19 to the radially inner side. For this reason, the refrigerant supplied from the evaporator to the motor chamber 37 through the suction port 3d is sucked into the compression chamber 35 and compressed. The refrigerant compressed to the discharge pressure is discharged from the discharge port 17d to the discharge chamber 43 and discharged to the condenser through the discharge port 1a. In this way, air conditioning of the vehicle air conditioner is performed.

At this time, in this electric compressor, vibration generate|occur|produces in the compression mechanism 11 and the motor mechanism 9. As shown in FIG. In the inverter case 30 , the bolts 49a to 49d penetrate the first peripheral wall 5a of the inverter box 5 and the second peripheral wall 7a of the inverter cover 7 , and further the motor Since it is inserted into the housing 3, in the inverter case 30, the vibration of the motor housing 3 is easily transmitted to the second bottom wall 7b through the respective bolts 49a to 49d during operation. Here, in this motor-driven compressor, the lattice 55c is formed by arranging a plurality of ribs 55 separated from the second peripheral wall 7a on the cover inner surface 8a of the second bottom wall 7b. . Also, a portion of these gratings 55c is at a common position equally spaced apart from the plurality of bolts 49a to 49d, respectively.

In this way, in this motor-driven compressor, due to vibration of the motor housing 3 during operation, in the inverter case 30 , the rib 55 does not exist and the vicinity of the flat second peripheral wall 7a tends to vibrate. . For this reason, the vibration of the motor housing 3 can be absorbed in the vicinity of the second peripheral wall 7a. Accordingly, it is possible to suppress the vibration of the motor housing 3 from being transmitted to the central portion of the second bottom wall 7b, and it is possible to suppress the vibration of the central portion of the second bottom wall 7b during operation. Here, in the second bottom wall 7b, it is the central portion at a common position equally distant from each of the bolts 49a to 49d that is likely to generate noise due to vibration. Therefore, while actively vibrating the vicinity of the second circumferential wall 7a, forming the grid 55c increases the rigidity of the central portion to suppress vibration, then the vibration of the motor housing 3 during operation is reduced to the inverter case ( 30), it is difficult to generate noise.

In particular, the plurality of grids 55c are sequentially formed, and the shapes of the plurality of grids 55c are the same, respectively. Therefore, the rigidity in the central portion is uniformly increased, and even if vibration is transmitted, the specific location is hardly deformed greatly, and as a result, it is easy to suppress the vibration in the central portion.

Moreover, the 2nd bottom wall 7b has the cover outer surface 8b located on the opposite side to the space 30a which accommodates the inverter 13 with respect to the cover inner surface 8a as a reference. An additional grating 57c is formed on the outer surface of the lid 8b. For this reason, since the rigidity in a center part becomes still higher and it becomes uniform, even if a vibration is transmitted, it is hard to deform|transform a specific location large, As a result, it is easy to suppress the vibration in a central part.

Therefore, this electric compressor can exhibit a high noise suppression effect. Moreover, the grating 55c formed by arranging each rib 55 and the additional grating 57c formed by arranging each additional rib 57 contribute to weight reduction of the motor-driven compressor rather than using the entire rib. In addition, in this electric compressor, the releasability at the time of casting the inverter cover 7 is improved by each rib 55 and each additional rib 57, and improvement of the durability of a mold can also be realized. have.

(Second embodiment)

The electric compressor of 2nd Embodiment differs from 1st Embodiment in the inverter cover 12, as shown in FIG. This inverter cover 12 is fastened to the motor housing together with an inverter box (not shown) by a plurality of bolts 61a to 61f. The ribs 59 formed on the inverter cover 12 are curved, and a plurality of grids 59c are formed between the ribs 59 . Each lattice 59c has a regular hexagonal shape. Each rib 59 extends to the vicinity of the second peripheral wall 12a, but is not continuous to the second peripheral wall 12a. Other configurations are the same as those of the first embodiment.

Also in this electric compressor, the same operation and effect as 1st Embodiment can be brought about.

(Third embodiment)

The electric compressor of 3rd Embodiment differs from 1st Embodiment in the inverter cover 14, as shown in FIG. This inverter cover 14 is also fastened to the motor housing together with an inverter box (not shown) by a plurality of bolts 63a to 63f. The ribs 65 formed on the inverter cover 14 include a horizontal rib 65a extending in a straight line in the horizontal direction, a right-angled rib 65b inclined to the right in the drawing and extending in a straight line, and a left side in the drawing. It is composed of a left inclined rib 65c that is inclined and extended in a straight line. A plurality of grids 65d are formed between the horizontal rib 65a, the right-angled rib 65b, and the left-angled rib 65c. Each grating 65d has an isosceles triangular shape. Each rib 65 extends to the vicinity of the second peripheral wall 14a, but is not continuous to the second peripheral wall 14a. Other configurations are the same as those of the first embodiment.

Also in this electric compressor, the same operation and effect as 1st Embodiment can be brought about.

In the above, although the present invention has been described according to the first to third embodiments, the present invention is not limited to the first to third embodiments, and can be applied with appropriate modifications within a range not departing from the gist thereof. Needless to say there is

For example, in the first to third embodiments, the compression mechanism 11 is a scroll type, but in the electric compressor of the present invention, it is also possible to employ other types of compression mechanisms such as a swash plate type and a vane type.

Moreover, in the said 1st - 3rd embodiment, although the inverter case 30 was comprised by the two parts of the inverter box 5 and the inverter cover 7, in the electric compressor of this invention, the inverter case which consists of a single part. The space 30a may be formed in

In the first to third embodiments, the substrate 51 of the inverter 13 is fixed to the bottom wall 3a on the rear side of the motor housing 3, but in the electric compressor of the present invention, one end is closed while You may fix to the bottom wall of the bottomed cylindrical inverter box 5 joined to the bottom wall 3a. By joining the inverter cover 7 to the bottomed cylindrical inverter box 5 , an independent case body is formed without dependence on the motor housing 3 .

Further, in the first to third embodiments, the inverter box 5 and the inverter cover 7 may have a cylindrical shape having the same diameter as that of the motor housing 3 . In this case, all of the bolts inserted through the inverter box 5 and the inverter cover 7 are fastened to the motor housing. A part of the gratings 55c, 59c, and 65d is positioned on the axis of the rotation shaft 23 .

11: compression mechanism
9: motor mechanism
13: inverter
3: Motor housing
30: inverter case
49a~49d: fasteners (bolts)
7a: circumferential wall (second circumferential wall)
7b: bottom wall (second bottom wall)
30a: space
8a: inner cover
55, 59, 65: Rib
55c, 59c, 65d: lattice
8b: outer surface of the cover
57: extra ribs
57c: additional grid

Claims (3)

a compression mechanism configured to compress the fluid;
a motor mechanism configured to drive the compression mechanism;
an inverter configured to drive the motor mechanism;
A motor housing having a cylindrical shape and accommodating the motor mechanism therein;
an inverter case accommodating the inverter therein;
and a plurality of fasteners for fastening the inverter case to the motor housing,
The inverter case has a circumferential wall having a cylindrical shape and a bottom wall blocking one end of the circumferential wall,
The bottom wall has an inner surface of the cover positioned to face the space accommodating the inverter,
The fastener is inserted through one end of the motor housing while penetrating the peripheral wall,
On the inner surface of the cover, a plurality of linear ribs are formed between the plurality of fasteners and spaced apart from the peripheral wall, respectively, and a grid is formed by arranging the plurality of ribs,
The peripheral wall and the rib are installed upright toward the motor housing from the inner surface of the cover,
The grid is one of a plurality of grids formed in succession, and the shapes of the plurality of grids are the same,
The bottom wall has an outer surface of the cover located on the opposite side to the space accommodating the inverter with respect to the inner surface of the cover,
A plurality of additional ribs are formed on the outer surface of the cover, and a plurality of additional lattices arranged in a row by arranging the plurality of additional ribs are formed,
The plurality of grids and the plurality of additional grids have the same square shape,
The plurality of grids and the plurality of additional grids are arranged such that an edge of the other side of the grid and the additional grid is located at the center of an area surrounded by one of the grid and the additional grid electric compressor. delete delete

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